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Definition of: fiend
(fēnd) noun
1. An evil spirit; a devil; demon.
2. An intensely malicious or wicked person; one having a cruel, diabolical spirit.
3. Colloq. One unduly devoted to some theory or occupation; one exceptionally interested in and clever or talented in a certain subject: an algebra fiend; a crank; monomaniac: a fresh–air fiend.
4. Colloq. One morbidly addicted to the use of a narcotic drug or some deleterious habit: a cocaine fiend.
5. An implacable enemy; foe.
—the Fiend Satan; the devil. [OE fēond enemy, devil]
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